I am interested as well in this kind of info and before the thread becomes too fuzzy, I want to repost the question: What VGA cards do support 848x480 on VGA output?
or let me ask different way:

What OS/card/driver version are U using to get 848x480 on VGA?

since I am currently using Linux, and I can see there are new WindowsXP drivers out there for Epia-M (which is my M/B) onboard VGA - CLE266_XP2K_16943209, I would like to know if someone has tried this resolution on VGA output and sucseeded.